I am native to the market so I can answer "boots on ground" questions as well.

I also had a few because the regular outlets were not grounded in places which requires an electrician to fix them but is not major.

Just have to stand your ground a little more, but I agree, there is a happy medium here.

If you set up the automation and systems you mentioned above, AND get your boots on the ground team of a housekeeper and a handy-person, you will have no problem managing completely remotely. 

Could be that THEY have sewage issues that originated peripherally (above ground) and they are merely complaining about their problem specific to their lot.

This type of conversion is a classic 1031 strategy to use at the end of the growth phase of your investing career. 

During the due diligence phase you can verify your original assessment.

If this is a bad time to find a new tenant you may wish to counter offer or just work out the middle ground.  

For those who just broke ground on their projects I feel really bad for, this could be tens of millions that just evaporated.  

I had a realtor and convinced a family friend to be my eyes and ears on ground.